Hermann friese



(No Model.) 2 Sheets-Sheet 1..

H. PRIESP.. METALLIC PACKING FOR STUFPING BOXES.

No. 543,300. Patented July 23, 1895.

(No Model.) 2 sheets-sheet 2.

H. FRIESE. METALLIC PACKING PoR STUFFINGBOXES. No. 543,300. PatentedJuly 23, 1895.

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UNITED STATES PATENT OFFICE.

HERMANN FRIESE, OFHDORTMUND, GERMANY.

METALLIC PACKING FOR sTuFFlNe-BoxEs.

SPECIFICATION forming part of Letters Patent No. 543,300, dated July 23,1895.

Application filed February 20, 1894. Serial No. 590,871. (No model.)Patented n Germany November 7, 1892, No. 9,357; in I EnglandDereinber22, 1892, No. 23,597, and in Austriadungary November 3, 1893, No. 18,286and No. 82,267.

' follows: in England, No. 23,597, dated December 22, 1892; in Germany,Gebrauchmuster, No. 9,357, dated November 7, 1892, and .inAustria-IIungary, No. 18,286 and No. 82,267,

dated 4November 3, 1893;) and I do hereby de.-A

clare the following tobe a full, clear, and exact description of myinvention, such'as will enable others skilled in the art to which itappertains to make and use the same.

My invention consists in the novel features hereinafter described withreference to the accompanying drawings, which illustrate one form inwhich I have contemplatedembodying my invention, and said invention isfully disclosed in the following description and claim.

The metallic packing for stuffing-boxes as illustrated in theaccompanying drawings is particularly suitable for use in machines formaking ice by the ammonia process, and also in other machines of thekind in which there is a possibility of loss accruing througlrleakage orescape of gases.- Vhile such stuffingboxes as heretofore constructed canbe employed for steam-engines, because any steam that might escape wouldnot thereby cause any smell and would not constitute an appreciableloss, yet when used in machines for making ice by the ammonia process agreat drawback has heretofore been found to exist, inasmuch as suchstuffing-boxes are not successful for making joints sufficiently tightto prevent leakage of the ammonia-gases to some extent.

In carrying out my invention the packing is formed of two metal coils orspirals having inclined faces engaging each other and one coil havingportions for engaging the inner walls of the stuffing-box and the otherhaving portions for engaging the rod, so that when endwise pressure isexerted upon the packing one of said coils will be forced outwardly intoengagement with the box and the other will be compressed tightly aboutthe rod,.forming a very tight packing. The space between the coils ofeach spiral forms spiral channels adjacent to thewalls of the box andadjacent to the rod tocontain oil for lubricating the rod and also toact as a seal to prevent the escape of the ammonia-gas.

In the said drawings, Figure l is a sectional view of a stuffing-boxprovided with my improved packing. Fig. 2 is a sectional view of thepacking removcdfrom the stuffing-box. Eig. 3 is a view of the completepacking, part I of said figure-showing the`two spirals in elevation,part Il showing the exterior spiral in section and the inner spiral inelevation, and part III showing both parts in section.

In the drawings, a represents the stuffingbox, c the piston or other rodpassing through the same, and b the compressing-collar for thestuffing-box, which will be provided with any usual form of tighteningdevice (not shown) for forcing it down into the box in the usual manner.

B represents my improved metal packing, which consists of two parts Band B2, each part consisting of anumber of coils or expansible rings,forming a spiral. The spiral B has the inner periphery of its coils orrings constructed to engage the piston-rod c, and the upper and lowerfaces of each coil are inclined toward each other, as shown, and theouter periphery of the coils do not extend quite to the walls of thestuffing-box.

The spiral part B2 is constructed exactly opposite to the part B and hasouter peripheral portions for engaging the Walls of the box a, and theupper and lower faces of each of its coils are inclined tocorrespond'with and engage the inclined faces of the spiral adjacent tothe rod for the reception of oil.

lt will thus be seen that diameters of the outer and inner peripheralportions of the inner spiral are less than the diameters of the outerand inner peripheral portions of the outer spiral. ..e/

It will/be readily seen that when endwise TOO pressure is applied to thepacking by means of the collar b the packing Will be compressed, and bymeans of the inclined faces of the spirals the coils of the spiral BWill be compressed tightly around the piston-rod @,While the coils ofspiral B2 Will be forced tightly into engagement With the Walls of thestuffing-box, thus forming a very tight joint. Oil is supplied to theoil-channels d and d in any desired Way, or, as indicated in dottedlines in Fig. 1, by means of a suitable oil-feed. I prefer toprovide oneor both ends of the packing With a metal ring or Washer C, as shown inFig. 3, but this is not essential.

What I claim, and desire to secure by Letters Patent, isn A metalpackingVY consistingof two spirals peripheral portions of the outerspiral, forming a spiral oil receiving channel on the outer and innerportions of the packing, extending continuously from one end of thepacking to the other substantially as described.

In Witness whereof I have hereunto set my hand in presence of twowitnesses.

HERMANN FRIESE. Witnesses: HERMANN ScHoLZ, FRANTZ ULPsoFF.

